Due Diligence: What It Means for Business Buyers

What Is Due Diligence?

Due diligence is the structured process of verifying everything a seller has represented about their business before you wire money and close the deal.

You sign a Letter of Intent. The exclusivity clock starts. You now have 30 to 60 days to confirm the business is what they say it is.

That means pulling every material document, stress-testing the financials, talking to the accountant, walking the facility, and building enough conviction to commit several hundred thousand dollars of your own equity and several million in SBA debt.

How Does Due Diligence Apply to SBA Acquisitions?

SBA lenders care about due diligence too. The bank is putting up 70% to 85% of the acquisition price. They need the same comfort you do.

A well-run due diligence process does three things simultaneously: it validates the purchase price, it surfaces risks the seller may not have disclosed, and it satisfies the lender's underwriting requirements. When these three outputs align, deals close. When they do not, deals either reprice or die.

Here is how the categories break down.

Financial Due Diligence

This is where most of the work happens. You are trying to reconcile what the seller's broker says the business earns with what the IRS actually sees.

Request all of the following: - 3 years of business tax returns (federal) - 3 years of profit and loss statements, month by month - 3 years of balance sheets - Year-to-date financials - Bank statements for the past 12 to 24 months - Accounts receivable and accounts payable aging reports

If the tax returns show $200K in net income and the broker's recast shows $400K in SDE, you need to reconcile every dollar of that gap. Some add-backs are legitimate. Many are not.

SDE numbers from brokers can run 15% to 50% above what you will actually take home after servicing debt and running the business. Never underwrite to SDE without discounting it first.

Operational Due Diligence

You are buying a business, not a spreadsheet. Walk the facility. Talk to the team. Understand how the work actually gets done.

Key questions: Does the owner do 100% of business development? If the business runs because of one person's relationships and that person is leaving, revenue concentration in a human is just as dangerous as customer concentration in an account.

Also review: employee agreements, key man dependencies, vendor contracts, equipment condition, and any deferred maintenance that will hit you in year one.

Legal and Compliance Due Diligence

Request and review: - All material contracts (customer, vendor, supplier) - Lease agreements and any landlord consents required for assignment - Equipment leases and financing schedules - Pending or threatened litigation - Regulatory licenses and whether they transfer with the entity or require reapplication - Environmental compliance if the business touches hazardous materials

Lease assignment is one of the most common late-stage surprises. A landlord who refuses to assign a lease at reasonable terms can kill a deal in week seven. Identify this early.

Tax Due Diligence

Request payroll tax filings, sales tax compliance history, and any open IRS or state tax notices. Undisclosed tax liabilities can transfer to the buyer depending on the deal structure. An asset sale provides more protection here, but it is not a complete shield in all cases. Get a CPA involved.

Due Diligence Red Flags That Kill Deals

Based on Regalis Capital's analysis of recent acquisitions, these are the patterns that most reliably blow up or reprice deals:

• Revenue declining over 3 years with no clear explanation. A business is worth a multiple of future earnings, not past earnings.
• Customer concentration above 20%. If one customer represents more than 20% of revenue, your business is one contract cancellation away from a DSCR problem.
• Owner-dependent revenue. The owner is the primary salesperson and has no non-compete. Lenders flag this heavily.
• Undisclosed liabilities. Open lawsuits, back taxes, equipment liens, or personal guarantees the seller forgot to mention.
• Financials that do not tie to bank statements. P&Ls and bank deposits should roughly reconcile. When they do not, find out why before closing.
• Lease with less than 5 years remaining and no renewal option. SBA lenders require the lease term to cover the loan term in most cases.

Sample Deal Economics After Due Diligence Adjustment

Sellers often list at one multiple. Buyers close at another after due diligence. Here is what a repricing looks like:

As of Q1 2026:

These are rough estimates based on market data. Actual terms depend on individual qualification and lender.

The business repriced 21% after due diligence surfaced inflated add-backs. The DSCR stayed acceptable. The deal still closed because both sides had room to move.

Due Diligence Checklist by Category

Financial - 3 years federal tax returns - 3 years monthly P&Ls - 3 years balance sheets - YTD financials - 12 to 24 months bank statements - AR and AP aging

Operational - Organizational chart - Employee agreements and compensation - Vendor and supplier contracts - Equipment list with age and condition - Any deferred maintenance schedule

Legal - All customer contracts - Lease agreements - Equipment leases - Litigation history (pending and past 5 years) - Corporate formation documents, ownership records

Tax and Compliance - Payroll tax filings (past 3 years) - Sales tax compliance records - Any open IRS or state notices - Regulatory licenses and transferability

Customer and Revenue - Customer list with revenue by account - Top 10 customers as a percentage of total revenue - Any contracts with termination clauses triggered by ownership change

Related Terms

Understanding due diligence requires knowing how it connects to the broader deal process.

• Letter of Intent (LOI) - the signed agreement that opens the due diligence window and grants exclusivity
• SBA 7(a) Loan - the primary financing vehicle that relies on clean due diligence for underwriting approval
• Working Capital - often uncovered during due diligence as an item the acquisition price does not cover

Frequently Asked Questions

How long does due diligence take on a business acquisition?

Standard due diligence runs 30 to 60 days from LOI signing, depending on deal complexity and how quickly the seller delivers documents. Simpler businesses with clean books can move in 30 days. Multi-entity deals with complex ownership structures often need 60 days or more. Rushing this window is one of the most common and costly mistakes buyers make.

Can due diligence findings be used to renegotiate the purchase price?

Yes, and they often are. If due diligence surfaces revenue that does not tie to tax returns, undisclosed liabilities, or key-man dependencies, a buyer can go back to the seller with a revised offer or request additional seller financing on standby to compensate for the risk. Most sellers expect some adjustment after diligence if findings are material.

Does the SBA require due diligence on 7(a) acquisitions?

The SBA does not prescribe a specific due diligence checklist, but lenders do. The bank underwrites the loan based on verified cash flow, so your due diligence findings feed directly into the lender's credit analysis. If your diligence uncovers a 30% revenue decline that the broker's recast did not reflect, the lender may reduce the loan amount or decline the deal. Clean diligence and clean lender underwriting run in parallel.

Start Your Acquisition with the Right Process

Due diligence is where most buyers either protect themselves or get hurt. Skipping steps to close faster is how you end up owning a business worth half what you paid for it.

Regalis Capital's deal team conducts full due diligence alongside clients on every transaction, drawing on experience across 120 to 150 deals reviewed per week and $200M+ in completed acquisitions. If you are evaluating a business and want a second set of eyes on the numbers, start with a deal assessment here.